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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eacc505beb3533cd746b4755833b91aca80f0ab8834d5d96f2ad1a10ff5656' 
  AND token = '7bZi9BJTBkz23UmmQIcATmr7bDOrBwwAaCzJzz+JQ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}